I thought his 3D method was fantastic, especially when the targets were not in "normal" vertical orientation. The horizontal ones really make it clear why there shouldn't be any "acceptable" amount of trigger snatch or anticipation.
As far as round count per class goes, I know know that for me, a lower number is probably better, unless there is a lot of actual coaching going on (as opposed to just running drills). If I'm fatigued due to a high tempo/round count, I'm less likely to be able to apply an instructed change in my technique. I know, weight room, right?